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The tympanic nerve (Jacobson's nerve) is a branch of the glossopharyngeal nerve passing through the petrous part of the temporal bone to reach the middle ear. It provides sensory innervation for the middle ear, the Eustachian tube, the parotid gland, and mastoid cells. It also carries parasympathetic fibers destined for the parotid gland.
The chorda tympani nerve carries its information to the nucleus of solitary tract, and shares this area with the greater petrosal, glossopharyngeal, and vagus nerves. [8] When the greater petrosal and glossopharyngeal nerves are cut, regardless of age, the chorda tympani nerve takes over the space in the terminal field.
The tympanic plexus is a nerve plexus within the tympanic cavity formed upon the promontory of tympanic cavity by the tympanic nerve (branch of the inferior ganglion of glossopharyngeal nerve (CN IX)), and the superior and inferior caroticotympanic nerves (post-ganglionic sympathetic branches of the internal carotid plexus).
In the anatomy of humans and various other tetrapods, the eardrum, also called the tympanic membrane or myringa, is a thin, cone-shaped membrane that separates the external ear from the middle ear. Its function is to transmit changes in pressure of sound from the air to the ossicles inside the middle ear, and thence to the oval window in the ...
The tympanic nerve is the first branch of the glossopharyngeal nerve. It branches at the level of the inferior ganglion. It branches at the level of the inferior ganglion. Importantly, the axons which form the tympanic nerve do not synapse in this ganglion or have their cell bodies in it.
The floor of the cavity (also called the jugular wall) is narrow, and consists of a thin plate of bone (fundus tympani) which separates the tympanic cavity from the jugular fossa. It presents, near the labyrinthic wall, a small aperture for the passage of the tympanic branch of the glossopharyngeal nerve.
The axons of these neurons branch from the glossopharyngeal nerve at the level of the inferior ganglion and form the tympanic nerve along with the preganglionic parasympathetic axons from the inferior salivatory nucleus. The tympanic nerve then travels through the inferior tympanic canaliculus to the tympanic cavity forming the tympanic plexus ...
The pharyngeal branches of the glossopharyngeal nerve are three or four filaments which unite, opposite the constrictor pharyngis medius, with the pharyngeal branches of the vagus and sympathetic, to form the pharyngeal plexus. Branches from this plexus perforate the muscular coat of the pharynx and supply its muscles and mucous membrane.